Table 1 Rearrangements of pyrazolin-5-ones 1 and their isomers 2
From: N-heteroatom substitution effect in 3-aza-cope rearrangements
# | Pyrazolinones 1 & isomers 2 | Conditions temp./time | Products yielda(%) |
|---|---|---|---|
1 | 1a: R = Me | 180°C / 60 m | 4a: R = Me (35) |
2 | 1b: R = Ph | 180°C / 10 m | 4b: R = Ph (72) |
3 | 2a: R = Me | 180°C / 10 m | 4a: R = Me (90) |
4 | 2b: R = Ph | 180°C / 10 m | 4b: R = Ph (99) |
5 | 5a: R = Me | 180°C / 30 m | 6a: R = Me (30) |
6 | 7a: R = Me | 180°C / 10 m | 6a: R = Me (80) |